Jacob edson



, UNITED STATES r EN OFFICE.

"JAoosEDso ,or'BosroN,MAssAoHnsETTs Q'PUMR Specification of LettersPatentljfl'o. 10,885, dated May 9, 1854;.

To all whom it may concern Be it known that I, J ACOB EDsoN, of Boston,in the county of Suffolk and State of Massachusetts, have inventedcertain new and useful Improvements in Pumps, of which the following isa full, clear, and exact description, reference being had to the annexeddrawings, making part of this specification, in which- Figure l, is avertical section through the pump. Fig. 2, is an elevation of the same;Fig. 3, a portion of one of the brake bars.

The pumps of this description where the pump rod passes down through thecenter of the-air chamber, the air from the latter escapes graduallythrough the packing around the piston rod, and thus the efliciency ofthe air chamber is impaired, if not altogether destroyed.

To remedy this inconvenience and to obtain an air chamber that shall bepositively tight however loosely the pump rod may be .packed, is theobject of my first improvement; which consists in the attachment of atube A, to the interior of the pump B, as represented in Fig. 1, throughwhich the pump rod C, is permitted to pass, the tube being soldered orotherwise secured to the top of the air chamber so as to form an air andwater tight joint at a. It is evident now if the packing of the pump rodbe ever so imperfect no air can at any time escape from the air chamberafter the water has risen inthe pump to alevel with the bottom of thetube A.

My pump is designed to be used either as a lift or force pump, and maybe changed from one to the other by tightening or loosening the screw 6,to which is attached the packing c, of the piston, which is composed ofindia-rubber, or other suitable substance, and which is forced into theconical opening (Z. p

e are holes bored" through the socket f around its whole circumference,and opening a communication between the cup D, and the interior of thetube A.

, When the packingc, is raised asrepresented in Fig. 1, thecommunication be tween the, cup D, and the interior of the pump isopened through the holes 6, and

the pump may: be used as a lift pump.

. When the packing is depressed into the conical opening (Z, for thepurpose of packing the pump-rod, the communication between the holes 6and thetube A, is cut off, and

lVhen it becomes necessary to introduce water into the pump on puttingit into operation, the screw 1), is raisedand water is poured into thecup D, and passes through the holes e, into the body of the pump.

In order to increase the capacity of the air chamber when the pump isused as a force-pump, and at the same time to make use of a portion ofthe same as a water chamber, when the pump is used as a lift pump, Ihave adopted thefollowing device.

E is an inclined partition within the body of the pump descending fromthe top of the spout atg to a point it somewhatbelow the level 2' of thespout; it will be perceived that by means of this construction, when thepump is used as a lift-pump that the water will rise in the space belowthe bottom of the tube A, and will also cont-inueto flow from the spoutin an unbroken stream until the level of the water within the pump hasdescended to near the point it, the partition E, preventing the airwithin the pump from entering the spout and producing that continuedflow of water in a small stream for some time after the pump has ceasedto operate, as in lift pumps of ordinary constructions, while the spacebetween the point 72. and the bottom of the tube A, is made to serve atthe same time as an addition to the air chamber B, and also as a waterchamber as above specified.

Some method of securely attaching the brake-arm to the pump so that theymay be instantaneously and firmly secured thereto and at the same timebe easily removed is very desirable particularly for ships pumps. By theordinary mode of fastening the brake bars in place, however tight-1ythey may fit at the point 70, at the entrance of the socket F, if theydo not fit as tightly at their inner ends Z, they will still be loose,and even though they may be made to fit snugly from 70 to Z, they willoften work loose on being operated. To obviate this difficulty and tohold the handles on brake bars securely in the sockets, the latter arecast with a short section of the inclined edges or. screw threads m,projecting from their interior surface, the brake bar is then shaveddown upon one side so as easily to enter the oblong hole H, it is thenturned that the sharp edges m, may cut into the bar and draw it by theirinclination firmly into the socket, where it is held without the pos'sibility of shaking out of place though it may be instantly loosened forremoval by turning it back in the opposite direction.

I claim- 1. The tube A, in combination With the air chamber B,constructed and operating in the manner and for the purpose set forth.

2. The cup D in combination With the holes 6, and the packing 0,constructed and applied to a force-pump as described and 1G for thepurpose set forth.

. 3. The inclined partition E in the rear of the spout G, operating inthe manner and for the purpose set forth. I

JACOB EDSON. Witnesses:

J No. MURDooH, SAM. COOPER.

